typedef struct extent_hooks_s extent_hooks_t;

/*
 * void *
 * extent_alloc(extent_hooks_t *extent_hooks, void *new_addr, size_t size,
 *     size_t alignment, bool *zero, bool *commit, unsigned arena_ind);
 */
typedef void *(extent_alloc_t)(extent_hooks_t *, void *, size_t, size_t, bool *, bool *, unsigned);

/*
 * bool
 * extent_dalloc(extent_hooks_t *extent_hooks, void *addr, size_t size,
 *     bool committed, unsigned arena_ind);
 */
typedef bool(extent_dalloc_t)(extent_hooks_t *, void *, size_t, bool, unsigned);

/*
 * void
 * extent_destroy(extent_hooks_t *extent_hooks, void *addr, size_t size,
 *     bool committed, unsigned arena_ind);
 */
typedef void(extent_destroy_t)(extent_hooks_t *, void *, size_t, bool, unsigned);

/*
 * bool
 * extent_commit(extent_hooks_t *extent_hooks, void *addr, size_t size,
 *     size_t offset, size_t length, unsigned arena_ind);
 */
typedef bool(extent_commit_t)(extent_hooks_t *, void *, size_t, size_t, size_t, unsigned);

/*
 * bool
 * extent_decommit(extent_hooks_t *extent_hooks, void *addr, size_t size,
 *     size_t offset, size_t length, unsigned arena_ind);
 */
typedef bool(extent_decommit_t)(extent_hooks_t *, void *, size_t, size_t, size_t, unsigned);

/*
 * bool
 * extent_purge(extent_hooks_t *extent_hooks, void *addr, size_t size,
 *     size_t offset, size_t length, unsigned arena_ind);
 */
typedef bool(extent_purge_t)(extent_hooks_t *, void *, size_t, size_t, size_t, unsigned);

/*
 * bool
 * extent_split(extent_hooks_t *extent_hooks, void *addr, size_t size,
 *     size_t size_a, size_t size_b, bool committed, unsigned arena_ind);
 */
typedef bool(extent_split_t)(extent_hooks_t *, void *, size_t, size_t, size_t, bool, unsigned);

/*
 * bool
 * extent_merge(extent_hooks_t *extent_hooks, void *addr_a, size_t size_a,
 *     void *addr_b, size_t size_b, bool committed, unsigned arena_ind);
 */
typedef bool(extent_merge_t)(extent_hooks_t *, void *, size_t, void *, size_t, bool, unsigned);

struct extent_hooks_s
{
    extent_alloc_t * alloc;
    extent_dalloc_t * dalloc;
    extent_destroy_t * destroy;
    extent_commit_t * commit;
    extent_decommit_t * decommit;
    extent_purge_t * purge_lazy;
    extent_purge_t * purge_forced;
    extent_split_t * split;
    extent_merge_t * merge;
};
